Arrange the 9 toothpicks thus:
7 + 3
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0.30 is the answer. to name an equivalent decimal, you simply add or take zeros away from the end of the number without changing the original number. Another example would be 1.42000, to name an equivalent decimal, you would take one or more of the zeros away from the end and make it 1.4200 or 1.42.
Forty of them.
it 30
90